Finding the Fourth Proportional to 660,499.31, 911,489.05 and 358,693.31

Step by Step Solution

1. Step 1: Write the proportion equation
   660,499.31 : 911,489.05 = 358,693.31 : x
2. Step 2: Convert to fraction form
   660,499.31/911,489.05 = 358,693.31/x
3. Step 3: Cross multiply
   660,499.31x = 911,489.05 × 358,693.31
4. Step 4: Simplify right side
   660,499.31x = 326,945,027,100.35
5. Step 5: Solve for x
   x = 326,945,027,100.35/660,499.31
6. Step 6: Final answer
   x = 494,996.77